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Heat/Mass Transfer Characteristics on Shroud with Turbine Blade Tip Clearances
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 Title & Authors
Heat/Mass Transfer Characteristics on Shroud with Turbine Blade Tip Clearances
Lee, Dong-Ho; Choe, Jong-Hyeon; Jo, Hyeong-Hui;
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 Abstract
The present study is conducted to investigate the local heat/mass transfer characteristics on the shroud with blade tip clearances. The relative motion between blade and shroud has little influence on the overall heat transfer characteristics, except some local effects. Therefore, the relative motion between the blade and shroud is neglected in this study. A naphthalene sublimation method is employed to determine the detailed local heat/mass transfer coefficients on the surface of the shroud. The tip clearance is changed from 0.66% to 2.85% of the blade chord length. The flow enters the gap between the blade tip and shroud at the pressure side due to the pressure difference. Therefore, the heat/mass transfer characteristics on the shroud are changed significantly from those with endwall. At first, high heat/mass transfer occurs along the profile of blade at the pressure side due to the entrance effect and acceleration of the gap flow. Then, the heat/mass transfer coefficients on the shroud increase along the suction side of the blade because tip leakage vortices are generated and interact with the main flow. The results show that the heat/mass transfer characteristics are changed largely with the gap distance between the tip of turbine blade and the shroud.
 Keywords
Turbine Cascade;Tip clearance;Shroud;Heat/mass Transfer;Naphthalene Sublimation Method;
 Language
Korean
 Cited by
 References
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